In Photoshop:

Duplicate layer as bloom. Use treshold or levels to clip
non-overexposed parts to black. Set layer mode to screen.
Gaussian blur. Adjust layer opacity and/or levels.

A variation of this can be used to get nice colored halos
to white or colored overexposed areas. Make a copy of bloom
layer and colorize it to dark saturated color, blur more.
Another copy is colorized lighter and different hue and less
saturated, blur less.

If PSP has macros this can be automated.


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Kari Kivisalo

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